Air-superheater



(No Model.) I I F. G. PETELER.

AIR SUPERHB-A'I'E'R.

N0. 158;037. Patented Aug. 18 1891! immmmmwmmwfi m l V 8 0% 0 do} 0 o o o Pfizzzessaz- Y InVE'izta-z: 6% 0 Tran]: 512 2 252 51:

UNITED STATES PATENT OFFICE.

FRANK. O. PETELER, OF MINNEAPOLIS, MINNESOTA.

AIR-SU PERH EATER.

SPECIFICATION forming part Of Letters Patent No. 458,037, dated August 18, 1891. Application filed August 15, 1890. Serial Ila-362,063. (No model.)

To all whom it may concern.-

Be it known that I, FRANK. (3. PETELER, of Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain Improvements in Air-Superheaters for Use in Connection with Furnaces, of which the following is a specification.

.My invention relates to means whereby the air is heated to an intense degree and introduced above the burning fuel in the furnace fire-box,whereby all of the gases and smoke thrown 01f by the fuel are consumed and a much greater heat generatedby the furnace.

My invention consists in ahollow box or casting provided with a suitable inlet in its upper edge and with suitable outlet-openings in its lower edge placed in a slantingposition above the fire-box, the lower edge thereof being placed at one side of the fire-box and just above the coals, whereby the air brought in at the inlet by the draft of the furnace is heated while in the box and discharged through the lower openings to mingle with the gases arising from the burning fuel, so that the same are more successfully consumed and a greater heat generated. I preferably provide an inlet-pipe connected with said inlet and extending downwardly to a level below the fire-box.

My invention consists in the use of any apparatus whereby the air is heated within the furnace and drawn down to the level of the upper surface of the fire or coals and there discharged upon the same.

My invention will be more readily under stood by reference to the accompanying drawings, in which Figure 1 isa sectional elevation of a furnace provided with one of my superheating devices. Fig. 2 is a side elevation of the superheating-box shown in Fig. 1, partially in section. Fig. 3 is an end elevation thereof. Fig. 4 is a sectional top view thereof. Fig. 5 is a side elevation of the header form of superheater. Fig. 6 is an end elevation of the same.

As shown in Figs. 1 to 4, inclusive, the superheating box or casting 2 is provided with the interior opening or hollow 3, the outer sides of the box being preferably braced and connected by the stays 4, (shown in Figs. 2

and 4,) the office of the same being to prevent the warping of the box. The inlet-opening 5 is arranged in the upper cornerof the box 2 and is preferably provided with the threaded portion 6,into which the downwardly-projecting pipe 7 is screwed. The outlet-holes 8 are provided either in the lower part of the downward side of the box or in the end thereof and are of small diameter, the sum of all their areas being about equal to the area of the inlet-pipe 7.

The form of superheater shown in Figs. 5 and 6 consists in the long header 9, having a suitable inlet-pipe 10, similar to the pipe 7 of Fig. 1, connected to its outer end. The inner end 12 is closed by asuitable cap 13. The outlet from this header 9 is through the series of small pipes 14, leading out of the bottom of the header, as shown, the combined areas of all the small pipes being equal to that of the pipe 10, through which the air enters the header 9 from Without the furnace. The position i the furnace of either of these superheaters is that of the box 2 in the furnace 15 of Fig. 1, the angle at which the superheaterbox slants being preferably forty-five degrees, though any convenient position may be given the superheater. The lower end or edge of the box 2 is preferably embedded in the wall of the furnace or otherwise inclosed, so that the air escaping from the lower holes 8 will be compelled to find an exit beneath the superheater-box and to fiow across the bed of coals to thoroughly mix with the gases arising therefrom.

In the use of the header form of superheater the lower ends of the pipe maybe projected beneath a suitable shield which serves to .direct the air properly upon the fire. I preferably place the superheater so that the lower openings will be within the directline of draft passing to the smoke-flue, so that the.

In the practical use of my superheater it is found that the air brought through the inletpipe and heated to a very high degree in the superheater will be discharged from the lower holes with considerable velocity, and that when hard coal is used in the fire-pot a flame of over a foot in height will cover the burniug coals,while with bituminous coal a larger flame will be produced. It will thus be seen that the heat obtained from the fuel will be many times increased. In the ordinary furnace the flames from hard coal are of a bluish tinge and smalhwhilc if the same furnace is provided with my superheater a much larger flame of an intense white will be produced, thus showing that practically all the gases were burned and the greatest possible degree of heat obtained from the fuel.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. The combination, in a device of the class described, of the superheater provided with the inlet-opening in its upper portion, with a series of outlet-openings provided in the lower portion of the superheater, said superheater being arranged to bring said outlet-openings substantially on a level with the burning fuel in the furnace, and an inlet-pipe comm unicating with inlet-openiu g in said superheater and adapted to conduct air thereto from a point below the level of the outlet-openings in the super-heater, substantially as and for the purpose described.

2. The combination of the firebox and firebox chamber of the usual form with the superheater-box provided with the inlet in the upper part thereof, the downwardly-projectin g inlet-pipe connected therewith and adapted to conduct air thercinto from a level lower than that of the bottom of said box, said box occupying a slanting position above the firebox,the outlet-holes in the edge of said superhcater-box, said lower edge of the super heater-box being placed just above the firebox,whereby hot air is introduced into the firebox chamber at a level substantially the same as or just above the level of the coals in the fire-box, substantially as and for the purpose specified.

The combination of the fire box and chamber 15, provided with the smoke-outlet, with the superheater-box 2, provided with the inlet 5 and having the hollow portion 3, the outletholes 8, and the downwardly-projecting inlet-pipe 7, adapted to bringair from a point below the level of the fire-pot, the lower edge of said box 2 abutting against the side of the furnace or fire-box, whereby the air is compelled to take its course across the surface of the burning fuel in the fire-box,substantially as described.

In testimony whereof I have hereunto set my hand this 12th day of August, 1890.

FRANK. G. PETELER.

In presence of (3. (it. IIAWLEY, A. M. GASKILL. 

